Police say a 15-year-old girl was advertising herself as an escort on a website that features sexually oriented classified ads.

When an undercover officer showed up at a hotel in Oakland -- he found the girl accompanied by 37-year-old William Miller of Pittsburgh. According to police reports Miller demanded $300 for the undercover officer to have sex with the young girl. That's when Miller and the girl were arrested.

A federal grand jury later indicted Miller on charges including sex trafficking of a child.

He is only the second person in Western Pennsylvania charged federally with human trafficking in the past decade. But the FBI says there likely will be more.

“We did not have in Western Pennsylvania, three or four years ago, any human trafficking cases opened up. Now we have numerous cases opened up,” said FBI supervising special agent Brad Orsini.

The FBI is investigating whether a Bridgeville spa was part of a sex trafficking ring. Three Korean-born women were arrested earlier this month and charged with prostitution.

“At 15 years old I was kidnapped and put into prostitution,” said Marlene Carson of Columbus.

She says it happened when a neighbor -- a man trusted by her parents -- offered to take her and some friends to New York City.

“After about a month of begging our parents they said yes and it ended up being trafficking. We were sold into prostitution,” Carson said.

Years after escaping her captors, she started a shelter in Columbus for sex trafficking victims. It's called Rahab's Hideaway.

“We've been able to really hide them,” Carson said.

Last month she was at a human trafficking seminar in Pittsburgh, trying to convince law enforcement and social service agencies to start a similar shelter here.

She points out an advocacy group for trafficking victims gave Pennsylvania an F rating.

“Most of the states are failing in their grade levels because of the laws, because there's no training and because of the services these girls need that they're not receiving,” Carson said.

The 15-year-old Pittsburgh victim had run away from Three Rivers Youth, a shelter for troubled young people.

Shelter director Peggy Harris would not discuss the girl's case. But -- even though she says 10 percent of the girls at the shelter run away -- she was surprised to hear sex trafficking is a problem here.

“It's deplorable, number one, I mean it just smacks of slavery,” Harris said. “It's just even unfathomable to believe that this goes on.”

It's not just young girls who are being victimized. The FBI is also investigating allegations of labor trafficking - mostly involving immigrants forced to work for virtually nothing.

Two natives of Guatemala ended up in Pittsburgh after fleeing an alleged trafficker. They did not want to be identified because they fear the company that exploited them might seek retribution.

Mary Burke of the Southwestern Pennsylvania Anti-Human Trafficking Coalition has followed their case.

“They came to the United States with a legitimate visa. They thought they were working for someone who would actually pay them for their work. When they got to the United States they found out that was not the case,” Burke said.

She says companies sometimes take advantage of a law that requires immigrants with certain work visas to work for only one business.

“If that employer ends up being someone who victimizes them they have no freedom to move to another employer because of the restrictions on that visa. That renders them exceptionally vulnerable,” Burke said.

Grown men and young girls -- both vulnerable to traffickers.

“ I'm starting to deal with so many teenagers, 12, 13, 14 years old,” Carson said. “Everybody needs to be educated because it's just really bad out here.”

She's trying to educate more than just police and social service agencies. She has even talked with contractors and plumbers about how to spot trafficking operations inside a home.